The company said its investigation is focused on restaurant transactions between March 24 and April 18 of this year, but would not provide further details.
In a post on their website, the company explained that they will be notifying any customers that were affected as they work to determine specific timeframes and restaurant locations that may have been affected.
If you went to Chipotle in late March or early April, your burrito may have come with a side of credit card hacking. Chipotle encouraged customers to monitor their card activity.
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According to Fortune, Chipotle's chief financial officer (CFO), Jack Hartung, told investors this week: "We anticipate notifying any affected customers as we get further clarity about time frames and the restaurant locations that might have been affected".
The fast-casual restaurant said it recently detected unauthorized activity on its network that supports the payment system. Additional security measures have also been put in place. "If anyone sees an unauthorised charge, they should immediately notify the bank that issued the card".
Company officials haven't revealed any more information about the breach.